Spin dynamics in semiconductor nanocrystals

Details Spin dynamics in semiconductor nanocrystals Spin dynamics in semiconductor nanocrystals

2002-04-10

arxiv.org/abs/cond-mat/0204235v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

25 pages, 11 figures, table

Scientific paper

10.1103/PhysRevB.66.125307

Time-resolved Faraday rotation is used to study both transverse and longitudinal spin relaxation in chemically-synthesized CdSe nanocrystals (NCs) 22-80 Angstroms in diameter. The precession of optically-injected spins in a transverse magnetic field occurs at distinct frequencies whose assignment to electron and exciton spins is developed through systematic studies of the size-dependence and theoretical calculations. It is shown that the transverse spin lifetime is limited by inhomogeneous dephasing to a degree that cannot be accounted for by the NC size distribution alone. Longitudinal spin relaxation in these NCs occurs on several distinct timescales ranging from 100 ps-10 microseconds and exhibits markedly different dependencies on temperature and field in comparison to transverse spin relaxation.

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